表面活性剂吸附对促进甲烷水合物生成效果的影响

发布时间：2018-01-07 23:32

本文关键词：表面活性剂吸附对促进甲烷水合物生成效果的影响　出处：《化工学报》2017年04期 　论文类型：期刊论文

【摘要】：基于表面活性剂固-液界面吸附理论,在无搅拌条件下研究了十二烷基硫酸钠(SDS)、脂肪醇聚乙烯醚硫酸钠(AES)、脂肪醇聚乙烯醚(AEO)3种表面活性剂在不锈钢反应釜中对甲烷水合物生成的促进效果。结果表明:水合物的生成形态与表面活性剂吸附金属表面形态有良好的对应关系;SDS与AES在金属表面的吸附作用可使水合物成核速率提高,成核位置增多。由于AEO不能在金属壁面发生吸附,导致对水合物生成促进效果降低,在浓度为300 mg·L~(-1)的SDS、AES和AEO溶液中,水合物储气密度及平均储气速率分别为131.4、128.3、12.3(体积比)和5.8、7.6、0.07 mmol·min~(-1);逐步提高SDS溶液浓度(80~1200 mg·L~(-1))和AES溶液浓度(60~1350 mg·L~(-1)),水合物储气密度首先增大然后减小,储气速率线性增大。因此,合理选择表面活性剂种类及浓度,可显著促进水合物生成。
[Abstract]:Based on the surfactant of solid-liquid interface adsorption theory, without stirring were studied under the condition of twelve sodium dodecyl sulfate (SDS), fatty alcohol polyoxyethylene ether sodium sulfate (AES), fatty alcohol polyoxyethylene ether (AEO) to promote the effect of 3 kinds of surfactants on the formation of methane hydrate in a stainless steel autoclave. The results show that: the formation of hydrate and surfactant adsorption of metal surface morphology has a good relationship; SDS and AES can make hydrate nucleation rate increase in the adsorption of the metal surface, the nucleation position increased. Because AEO is not in the metal wall adsorption, resulting in reduced effect on gas hydrate formation, the concentration of 300 mg L~ (-1) SDS, AES and AEO in solution, gas hydrate density and the average storage rate were 131.4128.3,12.3 (volume ratio) and 5.8,7.6,0.07 mmol min~ (-1); gradually increase the concentration of SDS solution (80~1200 Mg - L~ (-1)) and AES solution The concentration of gas hydrate (60~1350 mg. L~ (-1)) increases firstly, then decreases, and increases the rate of gas storage linearly. Therefore, the selection of surfactant species and concentration can significantly promote hydrate formation.

【作者单位】：辽宁石油化工大学石油天然气工程学院;
【基金】：国家自然科学基金项目(41502100) 辽宁省自然科学基金项目(201602470) 辽宁省高等学校优秀人才支持计划项目(LR2013016)~~
【分类号】：O647.2;TE31
【正文快照】： 引言水合物即主体分子与客体分子在低温、高压条件下通过范德华力结合成的非化学计量性化合物[1]。在世界范围内,已知大约有100余种物质可以与水结合形成水合物,天然气水合物、二氧化碳水合物及氢气水合物是科研人员的主要研究对象。二氧化碳水合物可用来捕获和封存二氧化碳[2

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